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ocfs2: don't use handle for locking in allocation functions

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Instead we record our state on the allocation context structure which all
callers already know about and lifetime correctly. This means the
reservation functions don't need a handle passed in any more, and we can
also take it off the alloc context.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2006-10-06 18:34:35 -07:00
parent 8d5596c687
commit da5cbf2f9d
7 changed files with 75 additions and 155 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/ocfs2/dir.c
View File

@ -409,13 +409,6 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
mlog(0, "extending dir %llu (i_size = %lld)\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
handle = ocfs2_alloc_handle(osb);
if (handle == NULL) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
/* dir->i_size is always block aligned. */
spin_lock(&OCFS2_I(dir)->ip_lock);
if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
@ -428,8 +421,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
}
if (!num_free_extents) {
status = ocfs2_reserve_new_metadata(osb, handle,
fe, &meta_ac);
status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -437,7 +429,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
}
}
status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -450,7 +442,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
}
handle = ocfs2_start_trans(osb, handle, credits);
handle = ocfs2_start_trans(osb, NULL, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;

19
fs/ocfs2/file.c
View File

@ -463,13 +463,6 @@ restart_all:
(unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
fe->i_clusters, clusters_to_add);
handle = ocfs2_alloc_handle(osb);
if (handle == NULL) {
status = -ENOMEM;
mlog_errno(status);
goto leave;
}
num_free_extents = ocfs2_num_free_extents(osb,
inode,
fe);
@ -480,10 +473,7 @@ restart_all:
}
if (!num_free_extents) {
status = ocfs2_reserve_new_metadata(osb,
handle,
fe,
&meta_ac);
status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -491,10 +481,7 @@ restart_all:
}
}
status = ocfs2_reserve_clusters(osb,
handle,
clusters_to_add,
&data_ac);
status = ocfs2_reserve_clusters(osb, clusters_to_add, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -509,7 +496,7 @@ restart_all:
drop_alloc_sem = 1;
credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
handle = ocfs2_start_trans(osb, handle, credits);
handle = ocfs2_start_trans(osb, NULL, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;

26
fs/ocfs2/localalloc.c
View File

@ -64,7 +64,6 @@ static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
struct buffer_head *main_bm_bh);
static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_alloc_context **ac,
struct inode **bitmap_inode,
struct buffer_head **bitmap_bh);
@ -448,7 +447,6 @@ out:
* our own in order to shift windows.
*/
int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
struct ocfs2_journal_handle *passed_handle,
u32 bits_wanted,
struct ocfs2_alloc_context *ac)
{
@ -459,9 +457,7 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
mlog_entry_void();
BUG_ON(!passed_handle);
BUG_ON(!ac);
BUG_ON(passed_handle->k_handle);
local_alloc_inode =
ocfs2_get_system_file_inode(osb,
@ -472,7 +468,11 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
mlog_errno(status);
goto bail;
}
ocfs2_handle_add_inode(passed_handle, local_alloc_inode);
mutex_lock(&local_alloc_inode->i_mutex);
ac->ac_inode = local_alloc_inode;
ac->ac_which = OCFS2_AC_USE_LOCAL;
if (osb->local_alloc_state != OCFS2_LA_ENABLED) {
status = -ENOSPC;
@ -511,14 +511,10 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
}
}
ac->ac_inode = igrab(local_alloc_inode);
get_bh(osb->local_alloc_bh);
ac->ac_bh = osb->local_alloc_bh;
ac->ac_which = OCFS2_AC_USE_LOCAL;
status = 0;
bail:
if (local_alloc_inode)
iput(local_alloc_inode);
mlog_exit(status);
return status;
@ -774,7 +770,6 @@ bail:
}
static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_alloc_context **ac,
struct inode **bitmap_inode,
struct buffer_head **bitmap_bh)
@ -788,7 +783,6 @@ static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
goto bail;
}
(*ac)->ac_handle = handle;
(*ac)->ac_bits_wanted = ocfs2_local_alloc_window_bits(osb);
status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
@ -891,16 +885,8 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
mlog_entry_void();
handle = ocfs2_alloc_handle(osb);
if (!handle) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
/* This will lock the main bitmap for us. */
status = ocfs2_local_alloc_reserve_for_window(osb,
handle,
&ac,
&main_bm_inode,
&main_bm_bh);
@ -910,7 +896,7 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
goto bail;
}
handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS);
handle = ocfs2_start_trans(osb, NULL, OCFS2_WINDOW_MOVE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;

1
fs/ocfs2/localalloc.h
View File

@ -42,7 +42,6 @@ int ocfs2_alloc_should_use_local(struct ocfs2_super *osb,
struct ocfs2_alloc_context;
int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
struct ocfs2_journal_handle *passed_handle,
u32 bits_wanted,
struct ocfs2_alloc_context *ac);

26
fs/ocfs2/namei.c
View File

@ -334,13 +334,6 @@ static int ocfs2_mknod(struct inode *dir,
return status;
}
handle = ocfs2_alloc_handle(osb);
if (handle == NULL) {
status = -ENOMEM;
mlog_errno(status);
goto leave;
}
if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
status = -EMLINK;
goto leave;
@ -368,7 +361,7 @@ static int ocfs2_mknod(struct inode *dir,
}
/* reserve an inode spot */
status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
status = ocfs2_reserve_new_inode(osb, &inode_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -378,7 +371,7 @@ static int ocfs2_mknod(struct inode *dir,
/* are we making a directory? If so, reserve a cluster for his
* 1st extent. */
if (S_ISDIR(mode)) {
status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -386,7 +379,7 @@ static int ocfs2_mknod(struct inode *dir,
}
}
handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
handle = ocfs2_start_trans(osb, NULL, OCFS2_MKNOD_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
@ -1649,14 +1642,7 @@ static int ocfs2_symlink(struct inode *dir,
goto bail;
}
handle = ocfs2_alloc_handle(osb);
if (handle == NULL) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
status = ocfs2_reserve_new_inode(osb, &inode_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -1665,7 +1651,7 @@ static int ocfs2_symlink(struct inode *dir,
/* don't reserve bitmap space for fast symlinks. */
if (l > ocfs2_fast_symlink_chars(sb)) {
status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -1673,7 +1659,7 @@ static int ocfs2_symlink(struct inode *dir,
}
}
handle = ocfs2_start_trans(osb, handle, credits);
handle = ocfs2_start_trans(osb, NULL, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;

140
fs/ocfs2/suballoc.c
View File

@ -59,9 +59,6 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
struct inode *alloc_inode,
struct buffer_head *bh);
static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac);
static int ocfs2_cluster_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
@ -72,6 +69,7 @@ static int ocfs2_block_group_search(struct inode *inode,
u16 *bit_off, u16 *bits_found);
static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
@ -120,8 +118,16 @@ static inline void ocfs2_block_to_cluster_group(struct inode *inode,
void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
{
if (ac->ac_inode)
iput(ac->ac_inode);
struct inode *inode = ac->ac_inode;
if (inode) {
if (ac->ac_which != OCFS2_AC_USE_LOCAL)
ocfs2_meta_unlock(inode, 1);
mutex_unlock(&inode->i_mutex);
iput(inode);
}
if (ac->ac_bh)
brelse(ac->ac_bh);
kfree(ac);
@ -284,16 +290,8 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
mlog_entry_void();
handle = ocfs2_alloc_handle(osb);
if (!handle) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
cl = &fe->id2.i_chain;
status = ocfs2_reserve_clusters(osb,
handle,
le16_to_cpu(cl->cl_cpg),
&ac);
if (status < 0) {
@ -402,27 +400,38 @@ bail:
}
static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac)
struct ocfs2_alloc_context *ac,
int type,
u32 slot)
{
int status;
u32 bits_wanted = ac->ac_bits_wanted;
struct inode *alloc_inode = ac->ac_inode;
struct inode *alloc_inode;
struct buffer_head *bh = NULL;
struct ocfs2_journal_handle *handle = ac->ac_handle;
struct ocfs2_dinode *fe;
u32 free_bits;
mlog_entry_void();
BUG_ON(handle->k_handle);
ocfs2_handle_add_inode(handle, alloc_inode);
status = ocfs2_meta_lock(alloc_inode, handle, &bh, 1);
if (status < 0) {
mlog_errno(status);
goto bail;
alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
if (!alloc_inode) {
mlog_errno(-EINVAL);
return -EINVAL;
}
mutex_lock(&alloc_inode->i_mutex);
status = ocfs2_meta_lock(alloc_inode, NULL, &bh, 1);
if (status < 0) {
mutex_unlock(&alloc_inode->i_mutex);
iput(alloc_inode);
mlog_errno(status);
return status;
}
ac->ac_inode = alloc_inode;
fe = (struct ocfs2_dinode *) bh->b_data;
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(alloc_inode->i_sb, fe);
@ -473,12 +482,11 @@ bail:
}
int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_dinode *fe,
struct ocfs2_alloc_context **ac)
{
int status;
struct inode *alloc_inode = NULL;
u32 slot;
*ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
if (!(*ac)) {
@ -488,28 +496,18 @@ int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
}
(*ac)->ac_bits_wanted = ocfs2_extend_meta_needed(fe);
(*ac)->ac_handle = handle;
(*ac)->ac_which = OCFS2_AC_USE_META;
#ifndef OCFS2_USE_ALL_METADATA_SUBALLOCATORS
alloc_inode = ocfs2_get_system_file_inode(osb,
EXTENT_ALLOC_SYSTEM_INODE,
0);
slot = 0;
#else
alloc_inode = ocfs2_get_system_file_inode(osb,
EXTENT_ALLOC_SYSTEM_INODE,
osb->slot_num);
slot = osb->slot_num;
#endif
if (!alloc_inode) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
(*ac)->ac_inode = igrab(alloc_inode);
(*ac)->ac_group_search = ocfs2_block_group_search;
status = ocfs2_reserve_suballoc_bits(osb, (*ac));
status = ocfs2_reserve_suballoc_bits(osb, (*ac),
EXTENT_ALLOC_SYSTEM_INODE, slot);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -523,19 +521,14 @@ bail:
*ac = NULL;
}
if (alloc_inode)
iput(alloc_inode);
mlog_exit(status);
return status;
}
int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_alloc_context **ac)
{
int status;
struct inode *alloc_inode = NULL;
*ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
if (!(*ac)) {
@ -545,22 +538,13 @@ int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
}
(*ac)->ac_bits_wanted = 1;
(*ac)->ac_handle = handle;
(*ac)->ac_which = OCFS2_AC_USE_INODE;
alloc_inode = ocfs2_get_system_file_inode(osb,
INODE_ALLOC_SYSTEM_INODE,
osb->slot_num);
if (!alloc_inode) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
(*ac)->ac_inode = igrab(alloc_inode);
(*ac)->ac_group_search = ocfs2_block_group_search;
status = ocfs2_reserve_suballoc_bits(osb, *ac);
status = ocfs2_reserve_suballoc_bits(osb, *ac,
INODE_ALLOC_SYSTEM_INODE,
osb->slot_num);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
@ -574,9 +558,6 @@ bail:
*ac = NULL;
}
if (alloc_inode)
iput(alloc_inode);
mlog_exit(status);
return status;
}
@ -588,20 +569,17 @@ int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
{
int status;
ac->ac_inode = ocfs2_get_system_file_inode(osb,
GLOBAL_BITMAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (!ac->ac_inode) {
status = -EINVAL;
mlog(ML_ERROR, "Could not get bitmap inode!\n");
goto bail;
}
ac->ac_which = OCFS2_AC_USE_MAIN;
ac->ac_group_search = ocfs2_cluster_group_search;
status = ocfs2_reserve_suballoc_bits(osb, ac);
if (status < 0 && status != -ENOSPC)
status = ocfs2_reserve_suballoc_bits(osb, ac,
GLOBAL_BITMAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (status < 0 && status != -ENOSPC) {
mlog_errno(status);
goto bail;
}
bail:
return status;
}
@ -610,7 +588,6 @@ bail:
* use so we figure it out for them, but unfortunately this clutters
* things a bit. */
int ocfs2_reserve_clusters(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
struct ocfs2_alloc_context **ac)
{
@ -618,8 +595,6 @@ int ocfs2_reserve_clusters(struct ocfs2_super *osb,
mlog_entry_void();
BUG_ON(!handle);
*ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
if (!(*ac)) {
status = -ENOMEM;
@ -628,12 +603,10 @@ int ocfs2_reserve_clusters(struct ocfs2_super *osb,
}
(*ac)->ac_bits_wanted = bits_wanted;
(*ac)->ac_handle = handle;
status = -ENOSPC;
if (ocfs2_alloc_should_use_local(osb, bits_wanted)) {
status = ocfs2_reserve_local_alloc_bits(osb,
handle,
bits_wanted,
*ac);
if ((status < 0) && (status != -ENOSPC)) {
@ -1055,6 +1028,7 @@ out:
}
static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
@ -1067,7 +1041,6 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
struct buffer_head *group_bh = NULL;
struct ocfs2_group_desc *gd;
struct inode *alloc_inode = ac->ac_inode;
struct ocfs2_journal_handle *handle = ac->ac_handle;
ret = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb), gd_blkno,
&group_bh, OCFS2_BH_CACHED, alloc_inode);
@ -1115,6 +1088,7 @@ out:
}
static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
@ -1126,7 +1100,6 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
u16 chain, tmp_bits;
u32 tmp_used;
u64 next_group;
struct ocfs2_journal_handle *handle = ac->ac_handle;
struct inode *alloc_inode = ac->ac_inode;
struct buffer_head *group_bh = NULL;
struct buffer_head *prev_group_bh = NULL;
@ -1272,6 +1245,7 @@ bail:
/* will give out up to bits_wanted contiguous bits. */
static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
@ -1313,8 +1287,8 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
* by jumping straight to the most recently used
* allocation group. This helps us mantain some
* contiguousness across allocations. */
status = ocfs2_search_one_group(ac, bits_wanted, min_bits,
bit_off, num_bits,
status = ocfs2_search_one_group(ac, handle, bits_wanted,
min_bits, bit_off, num_bits,
hint_blkno, &bits_left);
if (!status) {
/* Be careful to update *bg_blkno here as the
@ -1336,7 +1310,7 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
ac->ac_chain = victim;
ac->ac_allow_chain_relink = 1;
status = ocfs2_search_chain(ac, bits_wanted, min_bits, bit_off,
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, bit_off,
num_bits, bg_blkno, &bits_left);
if (!status)
goto set_hint;
@ -1360,7 +1334,7 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
continue;
ac->ac_chain = i;
status = ocfs2_search_chain(ac, bits_wanted, min_bits,
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
bit_off, num_bits, bg_blkno,
&bits_left);
if (!status)
@ -1401,10 +1375,10 @@ int ocfs2_claim_metadata(struct ocfs2_super *osb,
BUG_ON(!ac);
BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
BUG_ON(ac->ac_handle != handle);
status = ocfs2_claim_suballoc_bits(osb,
ac,
handle,
bits_wanted,
1,
suballoc_bit_start,
@ -1440,10 +1414,10 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
BUG_ON(ac->ac_bits_given != 0);
BUG_ON(ac->ac_bits_wanted != 1);
BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
BUG_ON(ac->ac_handle != handle);
status = ocfs2_claim_suballoc_bits(osb,
ac,
handle,
1,
1,
suballoc_bit,
@ -1546,7 +1520,6 @@ int ocfs2_claim_clusters(struct ocfs2_super *osb,
BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
&& ac->ac_which != OCFS2_AC_USE_MAIN);
BUG_ON(ac->ac_handle != handle);
if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
status = ocfs2_claim_local_alloc_bits(osb,
@ -1572,6 +1545,7 @@ int ocfs2_claim_clusters(struct ocfs2_super *osb,
status = ocfs2_claim_suballoc_bits(osb,
ac,
handle,
bits_wanted,
min_clusters,
&bg_bit_off,

4
fs/ocfs2/suballoc.h
View File

@ -43,7 +43,6 @@ struct ocfs2_alloc_context {
#define OCFS2_AC_USE_INODE 3
#define OCFS2_AC_USE_META 4
u32 ac_which;
struct ocfs2_journal_handle *ac_handle;
/* these are used by the chain search */
u16 ac_chain;
@ -60,14 +59,11 @@ static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
}
int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_dinode *fe,
struct ocfs2_alloc_context **ac);
int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
struct ocfs2_alloc_context **ac);
int ocfs2_reserve_clusters(struct ocfs2_super *osb,
struct ocfs2_journal_handle *handle,
u32 bits_wanted,
struct ocfs2_alloc_context **ac);